Turbine-balde shroud.



J. S. GREEN.

TURBINE BLADE SHROUD. APPLIOATIQR FILED 12.26, 1909.

Patented Dec. 5, 19-11.

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UNITED STATES PATENT OFFICE.

JONATHAN S. GREEN, 0]? PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE COLONIAL: TRUST COMPANY, TRUSTEE, OF PITTSBURGH, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

TURBINE-BLADE SHROUD.

To all whom it may concern:

Be it known that I, JONATHAN S. GREEN, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have made a new and useful Invention in Turbine-Blade Shrouds or Battles, of which the following is a specification.

This invention relates to turbine blade construction and more especially to covers or shrouds therefor, and has for its object to provide .a simple and reliable construction and one of minimum cost.

In the drawings accompanying this application and forming a part thereof: Figure 1 is a view in perspective of a plurality of blades provided with covers or shrouds constructed in accordance with this invention; Fig. 2 is'a view in perspective of a single blade machined for use in this construction; Fig. 3 is a view showing the face of a blade, the shroud or cover in cross seetion, and a spacing piece, such as utilized between adjacent blades, in section; and,

Fig. 4 is a view in perspective of a portion of one-half of the cover 'or shroud used in this invention.

It will be understood, that the invention is equally applicable to the stationary blades, generally termed vanes, of a turbine, although in the drawings I have ilhistrated it as applying to the rotary blades or buckets only without any idea, however, of limiting the invention to such use. I

In carrying out the invention a blade 5 of any desired cross section andformed in any desired manner, either drawn or east or drop forged, is milled near one end as shown at 6 so as to leave a rectangular connection portion 7 joining the top and bottom portions of the blade.

The blades may be secured in any suitable manner to the turbine element and, it de sired, may be assembled into groups prior to assemblage in the turbine, as shown in Fig. 1. In this view separate s acing members 8 lie, between ad acent b ades and a wire or rod 9 asses through the spacing members and biildes, thespaeing members being provided with holes 10 to'receive the Specification of Letters Patent.

Application filed April 28, 1909.

Patented Dec. 5, 1911.

Serial No. 492,735.

rod or wire while the blades are provided with holes 11 for the same purpose. A shroud or cover formed of two portions 12 and 13 secures the outer or i 'ee ends of the blades together and each of the portions is provided with a flange 14 which, when the shroud or cover is in place, projects longitudinally of the blade and preferably beyond the outer or free end thereof. The other portion of each shroud piece is notched as at 15 and the notches are of such width as to snugly fit the rectangular portions 7 lying between the ends of the blades. Each of the notched portions is also provided with holes 16 and when the two portions are assembled to form the complete shroud, they are secured together and in place on the blades by means of rivets 17 which pass through the holes 16. The outer end of each blade, or rather the horns of the crescent are trimmed away as at 18 so that the outer face of the flanges 14 will lie in the )lane of the edge of the lower portion oi the blade.

Having thus described my invention, what I claim is:

1. In combination with turbine blades or buckets provided with headed tenons, of a two-part shroud or cover provided with flanges extending beyond the heads of said tenons, and means independent of said tenons for securing the parts of said shroud together.

2. A shroud for turbine blades or buckets comprising two portions which when secured in position form a shroud or channel section, each portion being notched along one edge thereof.

3. In a turbine, the combination of blades said blades or buckets fo holding said shroud in place.

5. A two-part flanged shroud for turbine.

lVitnesses C. V. MCGI-IEE, GEO. A. l/VALKER.

subscribed ruy uame' thisQf Zth day of April,

JNo. s. GREEN. v 

